Classifying Matter: Composition and States

What is the main difference between pure substances and mixtures?

• Pure substances have a variable composition.

• Mixtures have a fixed composition.

• Pure substances have a fixed composition.

• Mixtures cannot be separated.

Which of the following is an example of a pure substance?

• Trail mix

• Water

• Air

• Kool-Aid

Tags

NGSS.MS-PS1-4

What defines an element?

• It can be broken down chemically.

• It cannot be broken down chemically.

• It is a mixture of two or more substances.

• It has a variable composition.

Which of the following is a compound?

• Iron

• Gold

• Oxygen

• Water

What type of mixture is Kool-Aid?

• Element

• Heterogeneous

• Compound

• Homogeneous

In which state of matter are the atoms or molecules closely packed and locked in place?

• Solid

• Liquid

• Gas

• Plasma

Tags

NGSS.MS-PS1-4

What is the process called when a solid turns directly into a gas?

• Condensation

• Sublimation

• Freezing

• Melting

Which of the following is a physical change?

• Eating of glass by hydrofluoric acid

• Boiling of water

• Burning of wood

• Rusting of iron

What happens during a chemical change?

• The appearance of the substance changes.

• The state of matter changes.

• The composition of the matter changes.

• The substance remains the same.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What type of change is the dissolving of sugar in water?

• Physical change

• Chemical change

• Both physical and chemical change

• Neither physical nor chemical change